We dont apply this fix for conv view since there can be a mix of messages from different folders in conversations. It would be very confusing if we applied this logic to CV is some case and not others and expect the user to realize its b/c he has msgs spanning folders.

In short-some of that comes from searching is:sent vs in:sent vs actually clicking/browsing the sent folder. Personally I think in:sent or clicking the folder should show 'To:' while is:sent would not change the layout. Thus once you open the convo it should be 'to' instead of 'from' - however it currently does not (in RC1 that is):
-unless a zimbra employee can verify that this is already changed on their current build - as C21 talks about this but it doesn't mention if it's been fixed this way